Brand:TONGYA
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-GSM cellular network outgoing.-GSM cellular network incoming.
-DTMF caller ID.
-Support secondary dial.
-Lock card, lock terminal
-Send polarity reversal signal for billing meter while connection.
-Sending 12/16KHz pulse for billing meter while connection is also compatible.
-Support GPRS. (optional)
-Rechargeable battery, keep conversation for at least 3 hour when out of mains supply. (Optional)
-Transmit tariff for our company phone billing meter. (Optional)
